The Learning Curve for a Product Is 90 Percent

Multiple Choice

The learning curve for a product is 90 percent. The first unit took 10 hours to complete. The manufacturer wants to determine how many hours the fourth unit will take by using the logarithmic method. The coefficient b for that calculation is approximately

A) -.1053
B) -.1520
C) -.3219
D) .6931
E) 8.1